Android kotlin - sort mutable list by value

Question

This is the list:

[Videos(id=5, yt_id=yRPUkDjwr1A, title=test5, likes=0, kat=animals), Videos(id=4, yt_id=yRPUkDjwr1A, title=test4, likes=1, kat=pranks), Videos(id=3, yt_id=WkyUU9ZDUto, title=test3, likes=1, kat=pranks), Videos(id=2, yt_id=B_X9OQqtduE, title=test2, likes=0, kat=animals), Videos(id=1, yt_id=ywaKlGNiv80, title=test1, likes=0, kat=animals)]

How can I sort it by likes desc?

Thanks in advance!

forpas · Accepted Answer · 2019-02-24 21:39:08Z

7

You can use sortByDescending:

videos.sortByDescending { it.likes }

I think it is self explanatory.
If you want to assign the sorted result to another list use sortedByDescending:

val sortedList = videos.sortedByDescending { it.likes }

The result list's inferred type is List<Videos>, but if you want a MutableList:

val sortedList = videos.sortedByDescending { it.likes }.toMutableList()

edited Feb 24, 2019 at 21:39

answered Feb 24, 2019 at 21:22

forpas

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4 Comments

TheGreatCornholio Over a year ago

I tried: val finalvids = vids.sortByDescending { it.likes } but now finalvids is type "unit" and I can't use it as I would use vids, how to fix this?

TheGreatCornholio Over a year ago

Oh I see I don't need to put it in new val but still, can I do it somehow? Because I still need the old version too

forpas Over a year ago

sortedByDescending does not change the original list.

forpas Over a year ago

Change to val sortedList = videos.sortedByDescending { it.likes }.toMutableList()

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